Aerospace series - Hard anodizing of aluminium alloys

This technical specification addresses the processes and requirements for hard anodizing of aluminum alloys within the aerospace sector. It defines the necessary chemical treatments and electrical parameters to achieve a thick, dense oxide layer on aluminum and its alloys. The document outlines critical quality criteria, including coating thickness, microhardness, and adhesion properties, ensuring durability and performance under rigorous operational conditions. Detailed procedures for surface preparation, electrolyte composition, temperature control, and current density are provided to guide manufacturers. Furthermore, the standard specifies methods for inspecting the anodized surfaces and conducting post-treatment sealing processes. It establishes compatibility requirements with subsequent steps such as painting or bonding, which are essential for aerospace applications. The guidelines ensure consistent material properties across different batches and production facilities. Compliance with these technical provisions helps maintain structural integrity and corrosion resistance for aerospace components. This framework supports the manufacturing industry in producing reliable parts through standardized anodizing protocols.